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Finding the Fourth Proportional to 803.94, 1,108.71 and 679.92

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Solution

The fourth proportional to 803.94, 1,108.71 and 679.92 is: 937.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.94 : 1,108.71 = 679.92 : x
  2. Step 2: Convert to fraction form
    803.94/1,108.71 = 679.92/x
  3. Step 3: Cross multiply
    803.94x = 1,108.71 × 679.92
  4. Step 4: Simplify right side
    803.94x = 753,834.10
  5. Step 5: Solve for x
    x = 753,834.10/803.94
  6. Step 6: Final answer
    x = 937.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.